SLC 1 OPEN FAULT: NFW2-100 Trouble Code | Fire Alarm Resource Center

What This Code Means

This condition indicates an open circuit has been detected on the Signaling Line Circuit (SLC) loop or on an addressable device connected to the loop.

Common Causes

1A break or open circuit in the SLC loop wiring
2An open circuit on an addressable device
3SLC loop resistance exceeding the 40 ohm limit
4Incorrect wiring for a loop programmed as Style 6 or Style 7

Resolution Steps

Locate and repair the open circuit or loose connection in the SLC loop wiring and ensure that the loop resistance does not exceed 40 ohms. If the SLC Loop is programmed for Style 6, the trouble condition will latch at the FACP; once the loop has been repaired, wait at least 2 minutes and then press the Reset button at the FACP to clear the SLC trouble.

Manual References(1)

1notifierNFW2-100Installation2005p. 127, 126, 180, 172, 15 +15Open

Related Codes

INVREPInvalid reply from the addressable device, indicating a hardware problem.COMM FAULT 1The control panel has failed 10 total attempts to communicate with the primary Central Station phone number.DUCT SUPERVISORYA supervisory condition has been triggered by a duct smoke detector.NAC 1 FAULTA fault condition (open or short) on Notification Appliance Circuit 1.DIRTY2Maintenance alert indicating that a detector needs immediate maintenance due to being within 80% of its alarm threshold for 24 hours.

Notifier NFW2-100

What This Code Means

Common Causes

Resolution Steps

Manual References(1)

Field Notes

Related Codes

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